Instruments and Materials Flashcards
Stainless steel blades are sharper than carbon steel blades.
F
Carbon steel sharper
The most common scalpel and blade system used in dermatological surgery is the Bard-Parker
T
Carbon steel blades will maintain their sharpness longer than stainless steel blades.
F
Stainless steel sharpness lasts longer
Teflon coatings on scalpel blades reduce drag when cutting through tissue.
T
The #10 blade is wide with a sharp, convex belly, making it ideal for large excisions on thick skin, such as the trunk.
T
The #11 blade is tapered to a sharp point and used primarily for incision and drainage or for cutting sharp angles on flaps.
T
The #15 blade is shaped like a smaller version of the #10 blade.
T
used most often in derm surg
The Beaver handle is the handle of choice for large excisions on thick skin.
F
Best for small delicate work.
The iris scissor is sharp-tipped, short-handles and most often used for blunt or sharp dissection and cutting on the head and neck.
T
The Westcott scissor is similar to the iris scissor, except the blades are curved and tapered to a fine point tip.
F
This is true for the Gradle scissor
The Gradle scissor is unique in that it operates on a spring system where the blades come together as the handle arc is squeezed.
F
This is true for the Westcott scissor
The Mayo scissor has an almost 1-to-1 handle to blade ratio and is used for coarse dissection.
T
The Metzenbaum scissor is long-handled and is ideal for blunt or sharp dissection in areas that require a long reach.
T
Scissors that are used for cutting tissue will dull much faster if used to cut sutures as well.
T
Serrated forceps allow a firm grasp of tissue with reduced crush injury.
F
This is true for toothed forceps
Adson forceps have a relatively broad handle that tapers to a long, narrow tip.
T
They can be toothed or serrated
Skin hooks are less traumatic to the epidermis than forceps.
T
Haemostats are used for haemostasis of bleeding vessels.
T
Dull curettes create excessive tissue trauma and suboptimal outcome.
T
Tensile strength is not analogous to suture strength.
F
Suture strength is calculated by dividing the weight necessary to break the suture by its cross-sectional area.
T
Monofilament and synthetic sutures have less tissue reactivity than polyfilament and natural sutures.
T
Absorbable suture loses most of its tensile strength within 120 days of placement through either enzymatic digestion or tissue hydrolysis.
F
60 days, everything else is true
Surgical gut is rapidly degraded in 14 days.
F
4-5 days
The disadvantages of surgical gut include poor tensile strength, high tissue reactivity and poor knot stability.
T
Polydiaxone (PDS) is absorbed much faster than Dexon or Vicryl suture.
F
Much more slowly
Polyglactin 910 (Vicryl) is ideal for suturing cartilage because of its minimal tissue reactivity.
F
This is true for PDS
Oils and grease can be used for lubricating instruments.
F
Harden during sterilisation
Steam sterilisation is the most popular office method of sterilisation.
T
Steam autoclaves do not affect the sharpness of instruments.
F
Can dull sharp instruments
A chemical autoclave is similar to a steam autoclave, but uses formaldehyde and alcohol instead of distilled water.
T
Causes less dulling of instruments
